Here's why the clipped wing is better:

When the original Cub was designed, they used a squirrel in a cage for an engine. It needed a HUGE wing in order to generate enough lift to fly - It would be like flying a 40 size Cub with a 25 engine.

Later, pilots realized that if you put a real engine in it, it performed MUCH better, AND with the extra power, they didn't need all of the extra drag provided by that HUGE wing, so they literally "Clipped" a few feet off of each side.

The biggest problem with the big wing is that due to it's length, it generates a lot of Adverse Yaw. you can actually see it yaw to the left in a right-hand turn (And vice versa).

The clipped wing eliminates the excess yaw and will allow it to do some very nice aerobatics, but the plane will still float like a trainer.